package com.situ.mall.pattern.singleton;

public class Singleton1 {
    private static Singleton1 instance;
    private Singleton1() {}
    public static Singleton1 getInstance(){
        if(instance == null){
            synchronized (Singleton1.class){
                if(instance == null){
                    instance = new Singleton1();
                }
            }
        }
        return instance;
    }
}
